Malicious PDF — malware analysis report

Static analysis result for SHA-256 6e97627cb0dfdd11…

MALICIOUS

PDF

76.6 KB Created: 2021-09-14 05:16:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: f78ccf314bee036104b344132a49c36b SHA-1: acffdf32bc25877dfb0c22664c0de2e56a17af0d SHA-256: 6e97627cb0dfdd11adf9480c4cecf0a87fa4ea635e1649acc4b7393a72aed318
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The file was identified as malicious by ML classifiers and ClamAV, indicating it is a phishing or trojan PDF. It contains numerous embedded URLs, many pointing to compromised WordPress sites or disposable hosting, suggesting it functions as a link farm to distribute further malicious content. The presence of these links and the overall structure strongly indicate an attempt to lure users to external sites for exploitation or credential theft.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • PDF link farm points to compromised-WordPress upload storage medium PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM
    PDF contains multiple clickable links, across many distinct hosts, whose targets are random-slug files parked in the upload directories of vulnerable WordPress form plugins (FormCraft, Super Forms). This is the hallmark of the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains hosted on compromised sites. The PDF itself carries no exploit — the risk is the linked destinations.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://irlanc.ru/uplcv?utm_term=sniper+3d+gun+mod+apk PDF link annotation
    • http://qboardapp.com/wp-content/plugins/super-forms/uploads/php/files/d3cf319419b500cc98a25c2dbd54247b/29294454340.pdfIn PDF document text
    • http://sarica.com.tr/ckfinder/userfiles/files/74215762438.pdfIn PDF document text
    • https://christembassyromford.org/wp-content/plugins/super-forms/uploads/php/files/3431ae6fb50b4e624245b73fc05c4736/rimoxeketi.pdfIn PDF document text
    • http://xn----7sbqwxdbhblh2h.xn--p1ai/data/file/paxesig.pdfIn PDF document text
    • http://xn--h1agcmh.com/ckfinder/userfiles/files/67409824556.pdfIn PDF document text
    • http://dnt-mayak.ru/content/File/jalumojomijetegabu.pdfIn PDF document text
    • http://tivati.com/uploads/userfiles/file/vevefeniwasi.pdfIn PDF document text
    • https://xn--80apefbdm9ah5g.xn--p1ai/userfiles/65374402382.pdfIn PDF document text
    • https://bunian-co.com/other_files/File/44427769565.pdfIn PDF document text
    • http://phunphu.com/userfiles/file/51682579654.pdfIn PDF document text
    • http://www.premiumimport.nl/ckfinder/userfiles/files/13453581639.pdfIn PDF document text
    • http://savages.lu/imagesRTE/files/42136608289.pdfIn PDF document text
    • https://museuminiaturesbesalu.com/files/selewovilovodaduvafumezu.pdfIn PDF document text
    • https://eastoncn.housemember.com/uploads/files/32585328682.pdfIn PDF document text
    • https://nam.it/wp-content/plugins/formcraft/file-upload/server/content/files/161317f2e6c2f8---95455201954.pdfIn PDF document text
    • https://www.pfgpartners.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1613fc00c8dea9---jukatewejaxuko.pdfIn PDF document text
    • https://echipamente-scule.ro/userfiles/file/35360232630.pdfIn PDF document text
    • http://metabolit.ru/files/file/31007309217.pdfIn PDF document text
    • http://swhwsolution.it/ckeditor-ckfinder-integration/uploads/files/tupupineniziz.pdfIn PDF document text
    • https://rivieresoceanie.com/ckfinder/userfiles/files/92220500465.pdfIn PDF document text
    • https://www.grandeprairie.org/wp-content/plugins/formcraft/file-upload/server/content/files/1613e41af1daf5---fewatatape.pdfIn PDF document text
    • http://lesmashclub.com/imgUpload/files/71232031164.pdfIn PDF document text
    • https://www.ferienhof-schneider.de/wp-content/plugins/formcraft/file-upload/server/content/files/16138ac8b6ba25---gazajedovad.pdfIn PDF document text
    • http://csaladiegyteruautok.hu/userfiles/files/42920323904.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c8bc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC8BC 16960 bytes
SHA-256: 669fbb6eae63c313797b61b249a2fd32a622ec0c174786fc97a68080b0e110ce
font_01_sfnt_off0000f3cc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3CC 10864 bytes
SHA-256: 71aab6ba7374015d6fcf7803d16370835bbce2c8e88ea246f9fa10f8e3fabc30
font_02_sfnt_off00010ca4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10CA4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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